package com.example.big_event.interceptors;

import com.example.big_event.pojo.Result;
import com.example.big_event.utils.JwtUtil;
import com.example.big_event.utils.ThreadLocalUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

import java.util.Map;

@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //令牌验证
        String token = request.getHeader("Authorization");
        try {

            //检验redis中是否有token
            String redisToken = stringRedisTemplate.opsForValue().get(token);
            if(redisToken == null){
                //token已经失效
                throw new RuntimeException();
            }

            Map<String, Object> claims = JwtUtil.parseToken(token);

            //将业务数据存放在ThreadLocal中
            ThreadLocalUtil.set(claims);
            //放行
            return true;
        } catch (Exception e){
            //http响应状态码为401
            response.setStatus(401);
            //不放行
            return false;
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //清空ThreadLocal中的数据
        ThreadLocalUtil.remove();
    }
}
